/// <summary>
/// Loads a picture from the requested stream.
/// </summary>
private void LoadPicture(UnsafeNativeMethods.IStream stream)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
try
{
Guid g = typeof(UnsafeNativeMethods.IPicture).GUID;
UnsafeNativeMethods.IPicture picture = null;
try
{
picture = UnsafeNativeMethods.OleCreateIPictureIndirect(null, ref g, true);
UnsafeNativeMethods.IPersistStream ipictureAsIPersist = (UnsafeNativeMethods.IPersistStream)picture;
ipictureAsIPersist.Load(stream);
if (picture != null && picture.GetPictureType() == NativeMethods.Ole.PICTYPE_ICON)
{
IntPtr cursorHandle = picture.GetHandle();
Size picSize = GetIconSize(cursorHandle);
if (DpiHelper.IsScalingRequired)
{
picSize = DpiHelper.LogicalToDeviceUnits(picSize);
}
handle = SafeNativeMethods.CopyImage(
new HandleRef(this, cursorHandle),
NativeMethods.IMAGE_CURSOR,
picSize.Width,
picSize.Height,
0);
ownHandle = true;
}
else
{
throw new ArgumentException(string.Format(SR.InvalidPictureType,
"picture",
"Cursor"), "picture");
}
}
finally
{
// destroy the picture...
if (picture != null)
{
Marshal.ReleaseComObject(picture);
}
}
}
catch (COMException e)
{
Debug.Fail(e.ToString());
throw new ArgumentException(SR.InvalidPictureFormat, "stream", e);
}
}
/// <include file='doc\Cursor.uex' path='docs/doc[@for="Cursor.CopyHandle"]/*' />
/// <devdoc>
/// Duplicates this the Win32 handle of this <see cref='System.Windows.Forms.Cursor'/>.
/// </devdoc>
public IntPtr CopyHandle()
{
Size sz = Size;
return(SafeNativeMethods.CopyImage(new HandleRef(this, Handle), NativeMethods.IMAGE_CURSOR, sz.Width, sz.Height, 0));
}